Sockets - Packet Sending Exception

Question

I've written the following code:

byte[] packetdata = System.Text.ASCIIEncoding.ASCII.GetBytes("<hello world>");
            string ip = "000.000.000.000";
            int port = 80;
            IPEndPoint ep = new IPEndPoint(IPAddress.Parse(ip), port);
            Socket client = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
            client.SendTimeout = 1;
            while (true) client.SendTo(packetdata, ep);

I've tried entering the IP addresses of multiple computers (testing purposes), and every time, an Exception is thrown after a few seconds.

The exception:

SocketException was unhandled: A connection attempt failed because the connected party did not properly respond after a period of time or established connection failed because connected host has failed to respond

What does it mean? That the computer's IP is protected from network stressing attacks? Or is it just a code error?